the evo's running a bit odd

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Aug 20, 2008 | 10:04 PM

druminharley21

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Joined: May 2007

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the evo's running a bit odd

just a little background on my bike, its got 38000 total miles, and about 20k on a hop up kit. which included cam, 42mm mikuni carb, bored out, port and polish etc. whats happening is when i jump on the throttle, about 2/3rds of the way through my rpm range its dies out and lets out one big backfire. it only does it through first and second and gear, and when i get a good roll on the throttle it still happens, just not as drastically. any ideas? the 20k have been completely reliable and trouble free.

Aug 20, 2008 | 10:36 PM

fastjoe

Road Warrior

Joined: May 2008

Posts: 1,606

Likes: 29

From: Baytown Tx.

Could be an ignition problem. I'm no expert though. You might be able to get better answers in the EVO classic section of the forum.

Aug 20, 2008 | 11:46 PM

Clammy

Seasoned HDF Member

Joined: Nov 2004

Posts: 8,129

Likes: 1,981

From: Ottawa, CANADA

Sounds like you're leaning out at higher throttle ranges. Could be you have too small a main jet, or trash in the carb, or wrong needle, or clogged/malfunctioning accelerator pump. Those are the things I'd check first, along with making sure there are no air leaks at the manifold.

Cheers!